package com.heima.app.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.lang.annotation.Annotation;
import java.util.List;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取request,response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断是否为登录请求
        if (request.getURI().getPath().contains("/login")) {
            //登录请求直接放行
            return chain.filter(exchange);
        }
        //解析token
        try {
            //判断是否有token
            String token = request.getHeaders().getFirst("token");
            if (StringUtils.isBlank(token)){
                //没有则返回401
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //判断token是否有效
            Claims claims = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claims);
            assert claims != null;
            Object id = claims.get("id");
            request.mutate().header("userId",String.valueOf(id));
            if (result >0){
                //无效返回401
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            //解析失败返回401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
